Surgical stapling device with floating staple cartridge

ABSTRACT

A surgical stapling device includes tool assembly having an anvil assembly and a cartridge assembly including a cartridge channel and a staple cartridge supported within the cartridge channel. The cartridge channel has a pair of spaced sidewalls and a bottom wall. The cartridge assembly includes compression strips that are supported on upper edges of the side walls and are positioned to support the staple cartridge. In embodiments, each of the compression strips includes a connecting portion and the upper edge of each of the side walls defines a slot that is configured to receive the connecting portion of a respective compression strip to secure the compression strip to the side wall of the cartridge channel. In some embodiments, the tool assembly also includes a compressible pad that is supported on the bottom wall of the cartridge channel between the bottom of the cartridge channel and the staple cartridge.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No. 15/684,223, filed Aug. 23, 2017, the disclosure of which is incorporated by reference herein in its entirety.

BACKGROUND 1. Technical Description

The present disclosure is directed to a surgical stapling device and, more particularly, to a surgical stapling device including a tool assembly having a staple cartridge that is supported on a compressible base to accommodate tissues of different thicknesses.

2. Background of Related Art

Surgical stapling devices for ejecting staples to join tissue or tissue segments in a fast and efficient manner in a variety of surgical procedures, e.g., anastomoses procedures, are well known. Surgical stapling devices include a tool assembly having a cartridge assembly and an anvil assembly. The cartridge assembly and the anvil assembly define tissue contact surfaces that define a tissue gap when the tool assembly is in a clamped position. The tissue gap is dimensioned to receive tissue of a given thickness range to effect hemostasis. If the tissue positioned between the jaws is outside the defined range, either too thick or too thin, the tissue contact surfaces of the cartridge and anvil assemblies may not be properly positioned during firing of the stapling device to provide effective hemostasis. In addition, if the tissue thickness is misidentified by the clinician or if the tissue thickness falls near the outer edges of the range for a given staple size, the likelihood of ineffective hemostasis is increased.

Accordingly, a continuing need exists in the suturing arts for a surgical stapling device that is capable of providing effective hemostasis for a greater range of tissue thicknesses.

SUMMARY

In one aspect of the disclosure, a cartridge assembly includes a cartridge channel having a bottom wall and side walls that define a recess. Each of the side walls has a first end secured to the bottom wall and a second end spaced from the bottom wall defining an elongated slot. A staple cartridge defines a longitudinal axis and includes an upper wall defining a tissue contact surface and side walls. The upper wall extends radially outward of the side walls of the staple cartridge to define a longitudinally extending shoulder that is positioned adjacent to each of the side walls of the staple cartridge. The staple cartridge is dimensioned to be received within the recess of the cartridge channel such that the shoulders of the staple cartridge rest atop the side walls of the cartridge channel. A compression strip is supported in each of the elongated slots defined in the second end of the side walls of the cartridge channel. The elongated slots and the compression strips are configured to interlock to secure the compression strips to the cartridge channel.

In another aspect of the disclosure, a cartridge assembly includes a cartridge channel having a bottom wall and side walls defining a recess, and a staple cartridge defining a longitudinal axis and supporting a plurality of staples and a plurality of pushers. The staple cartridge is received within the recess of the cartridge channel. The staple cartridge has an upper wall defining a tissue contact surface and a plurality of staple retention slots. A compression pad is positioned between the bottom wall of the cartridge channel and the staple cartridge.

In embodiments, each of the compression strips includes a connecting portion that is received within the longitudinal slot.

In some embodiments, the connecting portion of each of the compression strips and the elongated slot are dove-tail shaped.

In certain embodiments, the second end of each of the side walls of the cartridge channel includes cutouts, the cutouts intersecting the elongated slot to divide the elongated slot into a plurality of segments.

In embodiments, each of the compression strips is formed of a plurality of segments, and each of the plurality of segments of the compression strips has a length that corresponds to a length of one of the plurality of segments of the elongated slots.

In some embodiments, each of the compression strips is formed from an elastic material.

In certain embodiments, the cartridge assembly includes a support plate and the staple cartridge includes staples and pushers and defines an open end opposite to the upper wall. The support plate is supported on the open end of the staple cartridge to retain the staples and pushers within the staple cartridge.

In embodiments, the staple cartridge and the support plate define a gap with the bottom wall of the cartridge channel.

In some embodiments, a compression pad is positioned in the gap between the staple cartridge and the bottom wall of the cartridge channel.

In certain embodiments, the cartridge channel and the staple cartridge each define a knife slot, and the compression pad includes a first half positioned on one side of the knife slots and a second half positioned on the other side of the knife slots.

In some embodiments, the compression pad is secured to the bottom wall of the cartridge channel using an adhesive.

In embodiments, the compression pad is formed from an elastic material.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of the presently disclosed tool assembly are described herein below with reference to the drawings, wherein:

FIG. 1 is a side perspective view of a surgical stapling device including an exemplary embodiment of the presently disclosed tool assembly in a clamped position;

FIG. 1A is an enlarged view of the indicated area of detail shown in FIG. 1;

FIG. 2 is a side perspective view of the tool assembly of FIG. 1 in an unclamped position with an anvil assembly of the tool assembly shown in phantom;

FIG. 3 is a side, perspective, exploded view of a cartridge assembly of the tool assembly shown in FIG. 2;

FIG. 3A is a cross-sectional view taken along section line 3A-3A;

FIG. 4 is a side perspective view of the a channel member of the cartridge assembly shown in FIG. 3 with compression strips attached to side walls of the channel member;

FIG. 5 is a side perspective view of the channel member of the cartridge assembly shown in FIG. 4 with the compression strips and a compression pad supported on the channel member;

FIG. 6 is an enlarged view of the indicated area of detail shown in FIG. 2;

FIG. 7 is an enlarged view of the indicated area of detail shown in FIG. 3;

FIG. 8 is an enlarged view of the indicated area of detail shown in FIG. 3;

FIG. 9 is a perspective view of the indicated area of detail shown in FIG. 8 as the compression strip is attached to the side wall of the channel member;

FIG. 10 is a cross-sectional view taken along section line 10-10 of FIG. 1A;

FIG. 11 is a cross-sectional view taken along section line 11-11 of FIG. 10;

FIG. 12 is a cross-sectional view taken along section line 11-11 of FIG. 10 with the tool assembly clamped on relatively thin tissue;

FIG. 13 is a side view of a staple of the cartridge assembly of FIG. 12 after the staple is deformed in thin tissue;

FIG. 14 is a cross-sectional view taken along section line 11-11 of FIG. 10 with the tool assembly clamped on tissue having a relatively moderate thickness;

FIG. 15 is a side view of a staple of the cartridge assembly of FIG. 14 after the staple is deformed in the tissue having a relatively moderate thickness;

FIG. 16 is a cross-sectional view taken along section line 11-11 of FIG. 10 with the tool assembly clamped on relatively thick tissue; and

FIG. 17 is a side view of a staple of the cartridge assembly of FIG. 16 after the staple is deformed in the relatively thick tissue.

DETAILED DESCRIPTION OF EMBODIMENTS

The presently disclosed surgical stapling device including a tool assembly with a floating staple cartridge will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. In this description, the term “proximal” is used generally to refer to that portion of the device that is closer to a clinician, while the term “distal” is used generally to refer to that portion of the device that is farther from the clinician. In addition, the term “endoscopic” is used generally used to refer to endoscopic, laparoscopic, arthroscopic, and/or any other procedure conducted through small diameter incision or cannula. In addition, the term clinician is used generally to refer to medical personnel including doctors, nurses, and support personnel.

The presently disclosed surgical stapling device includes a tool assembly having an anvil assembly and a cartridge assembly including a cartridge channel and a staple cartridge supported within the cartridge channel. The cartridge assembly includes a cartridge channel having a pair of spaced sidewalls and a bottom wall. The cartridge assembly includes compression strips that are supported on upper edges of the side walls of the cartridge channel and are positioned to support the staple cartridge. In embodiments, each of the compression strips includes a connecting portion and the upper edge of each of the side walls defines a slot that is configured to receive the connecting portion of a respective compression strip to secure the compression strips to the side walls of the cartridge channel. The compression strips allow the staple cartridge to move or float in relation to the anvil assembly of the tool assembly to accommodate tissues of different thicknesses.

In some embodiments, the tool assembly also includes a compressible pad that is supported on the bottom wall of the channel. The staple cartridge is supported on the compressible pad within the cartridge channel such that the staple cartridge can move or float within the cartridge channel.

FIG. 1 illustrates an exemplary embodiment of the presently disclosed surgical stapling device shown generally as 10. The stapling device 10 includes a handle assembly 12, a body portion 14 that defines a longitudinal axis “X” and extends from a distal portion of the handle assembly 12, and a tool assembly 100 supported on a distal portion of the body portion 14. In embodiments, the handle assembly 12 includes a stationary hand grip 16, a firing trigger 18, a rotation knob 20, and an articulation lever 22. The firing trigger 18 is actuatable to move the tool assembly 100 between an unclamped position (FIG. 2) and a clamped position (FIG. 1A) and to fire the stapling device 10. The articulation lever 22 is rotatable to pivot the tool assembly 100 in relation to the body portion 14 about an axis transverse to the longitudinal axis “X”. The rotation knob 20 pivotally supports the body portion 14 and the tool assembly 100 on the distal portion of the handle assembly 12. Rotation of the rotation knob 20 in relation to the handle assembly 12 causes corresponding rotation of the body portion 14 and tool assembly 100 in relation to the handle assembly 12.

For a detailed description of a handle assembly 12 including the firing trigger 18, rotation knob 20, and articulation lever 22, and other components of the stapling device 10 including the body portion 14, see U.S. Pat. No. 8,418,904 (“the '904 Patent”) which is incorporated herein by reference in its entirety. Although the presently disclosed tool assembly 100 is illustrated as part of a manually powered surgical stapling device 10, it is also envisioned that the tool assembly 100 could be incorporated into a powered surgical stapling device such as disclosed in U.S. Pat. Nos. 9,055,943 and 8,806,973 and U.S. Publication No. 2015/0076206 which are also incorporated herein by reference in their entirety.

Referring to FIGS. 1A and 2, the tool assembly 100 includes an anvil assembly 102 and a cartridge assembly 104. A proximal portion of the anvil assembly 102 is pivotally coupled to a proximal portion of the cartridge assembly 104 by a pair of pivot members 105 such that the anvil assembly 102 is pivotal in relation to the cartridge assembly 104 to move the tool assembly 100 between an unclamped position (FIG. 2) and a clamped position (FIG. 1A). It is envisioned that the cartridge assembly could also be pivotally supported to the anvil assembly 102. Although not shown, the anvil assembly 102 includes a tissue contact surface that includes a plurality of staple deforming depressions. See, e.g., the anvil assembly disclosed in the '904 Patent.

Referring to FIG. 3, in some embodiments the cartridge assembly 104 includes a staple cartridge 106 that supports a plurality of staples 108 and a plurality of pushers 110, a cartridge channel 112, a staple cartridge support plate 114, compression strips 116, compression pads 118, and an actuation sled 120. It is envisioned that the cartridge assembly 104 may include only compression strips 116 or compression pads 118 as discussed in further detail below. The staple cartridge 106 includes a tissue contact surface 124 (FIG. 3) that defines a central knife slot 106 a, and a plurality of rows of laterally spaced staple retention slots 124 a in the tissue contact surface 124. In embodiments, the tissue contact surface 124 is stepped downwardly from the central knife slot 106 a towards the outer edge of the staple cartridge 106. Alternately, the tissue contact surface 124 of the staple cartridge 106 can be planar. Each staple retention slot 124 a receives one of the staples 108 and a respective pusher 110.

The support plate 114 of the cartridge assembly 104 is secured to an open, lower end of the staple cartridge 106 opposite to the tissue contact surface 124 by a snap-fit or other type connection. The support plate 114 covers the open lower end of the staple cartridge 106 to retain the staples 108 and pushers 110 within the staple cartridge 106. The staple cartridge 106 also defines a plurality of longitudinal slots 130 (FIG. 11). The longitudinal slots 130 communicate with the open, lower end of the staple cartridge 106 and the staple retention slots 124 a to accommodate the staple pushers 110 and facilitate passage of the actuation sled 120 through the staple cartridge 106. As known in the art, advancement of the actuation sled 120 through the staple cartridge 106 lifts the pushers 110 within the retention slots 124 a to eject the staples 108 from the retention slots 124 a. See, e.g., the '904 Patent for a detailed description of the operation, and interaction of the actuation sled 120 and pushers 110.

The staple cartridge 106 includes opposite sidewalls 132 and an upper wall 134 that defines the tissue contact surface 124 and the staple retention slots 124 a. The upper wall 134 extends radially outward of the side walls 132 to define shoulders 136 (FIG. 3A). The staple cartridge 106 also includes protrusions 140 (FIG. 3) that extend radially outwardly of each of the side walls 132 of the staple cartridge 106 and facilitate securement of the staple cartridge 106 within the cartridge channel 112.

Referring also to FIGS. 4 and 5, the cartridge channel 112 includes a bottom wall 144 and spaced side walls 146 that together define a recess 148 that is dimensioned to receive the staple cartridge 106 and support plate 114 when the staple cartridge 106 and the support plate 114 are assembled. The bottom wall 144 defines a central longitudinal knife slot 150 that is aligned with the central knife slot 106 a defined in the staple cartridge 106 as well as a longitudinal knife slot 152 defined by the support plate 114. The knife slots 106 a, 150 and 152 are dimensioned to facilitate passage of a drive member and knife (not shown) through the staple cartridge 106. See, e.g., the '904 Patent for a detailed description of an exemplary embodiment of a drive member and knife of a surgical stapling device.

Referring also to FIGS. 3 and 6-9, the compression strips 116 are formed of a compressible and/or elastic material. Each of the compression strips 116 includes a support portion 156 and a connecting portion 158. In embodiments, the support portion 156 of each of the compression strips 116 defines a flat surface 156 a that is positioned and configured to support the shoulders 136 of the staple cartridge 106 (FIG. 3A).

In embodiments, the spaced side walls 146 of the cartridge channel 112 each define a retention slot 160 (FIG. 8) that is configured to receive a connecting portion 158 of the compression strips 116. In embodiments, the retention slots 160 and the connecting portions 158 of the compression strips 116 have interlocking configurations which mate to securely fasten the compression strips 116 within the retention slots 160. In some embodiments, the retention slots 160 and the connecting portion of the compression strips 116 each include have a dove-tail configuration although other interlocking configurations are envisioned, e.g., T-shaped slots, etc. The connecting portion 158 of the compression strips 116 are slidably received within the retention slots 160 to secure the compression strips 116 to the upper edges of the side walls 146 of the cartridge channel 112. In addition, adhesives, welding, friction fitting, or the like can be used to secure the compression strips from moving axially within the slots 160

Referring briefly back to FIGS. 4 and 5, the side walls 146 of the cartridge channel 112 each include a plurality of notches 170. The notches 170 provide access to ends of the retention slots 160 at a plurality of locations along the side walls 146 of the cartridge channel 112 to allow the connecting portions 158 of the compression strips 116 to be inserted into the retention slots 160 at multiple locations along the side walls 146.

Referring again to FIGS. 3 to 5, 10 and 11, in embodiments, the compression pads 118 are supported on the bottom wall 144 of the cartridge channel 112 between the bottom wall 144 and the support plate 114 of the cartridge assembly 104 (FIG. 11) on opposite sides of the knife slot 150. As discussed above in regard to the compression strips 116, the compression pads 118 are formed of an elastic and/or compressible material and support the staple cartridge 106 to facilitate movement of the staple cartridge 106 in relation to the anvil assembly 102 during clamping and firing of the surgical stapling device 10. In embodiments, the compression pads 118 include cut outs 118 a that provide space for expansion of the compression pad 118 during firing. Although shown as being circular, the cut outs 118 a can be of any configuration.

Referring to FIGS. 10-13, when thin tissue T1 is clamped between the tissue contact surface 124 of the staple cartridge 106 and the tissue contact surface 102 a of the anvil assembly 102 and the surgical stapling device 10 is fired, the forces applied to the compression strips 116 and the compression pads 118 is minimal such that the compressible strips 116 and pads 118 undergo minimal deformation or compression. As such, very little movement of the staple cartridge 106 in relation to the anvil assembly 102 occurs. Thus, the staple cartridge 106 remains in close relation to the anvil assembly 102 and the staple 108 a (FIG. 13) undergoes substantial deformation.

Referring to FIGS. 14 and 15, when thicker tissue T2 is clamped between the tissue contact surface 124 of the staple cartridge 106 and the tissue contact surface 102 a of the anvil assembly 102 and the surgical stapling device 10 is fired, the forces applied to the compression strips 116 and the compression pads 118 increases such that the compressible strips 116 and compression pads 118 undergo more substantial deformation or compression. As such, the staple cartridge 106 moves further downwardly away from the anvil assembly 102 to compensate for the thicker tissue T2. Thus, the staple cartridge 106 becomes spaced further from the anvil assembly 102 and the staple 108 b undergoes more substantial deformation.

Referring to FIGS. 16 and 17, when even thicker tissue T3 is clamped between the tissue contact surface 124 of the staple cartridge 106 and the tissue contact surface 102 a of the anvil assembly 102 and the surgical stapling device 10 is fired, the forces applied to the compression strips 116 and the compression pads 118 increases even further such that the compressible strips 116 and pads 118 undergo even more substantial deformation or compression. As such, the staple cartridge 106 moves further downwardly away from the anvil assembly 102 to compensate for the thicker tissue T3. Thus, the staple cartridge 106 becomes spaced even further from the anvil assembly 102 and the staple 108 b undergoes even more substantial deformation.

Although the surgical stapling device 10 is illustrated to include both compression strips 116 and compression pads 118, it is envisioned that the surgical stapling device need only include the strips 116 or the pads 118.

Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments. It is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another without departing from the scope of the present disclosure. As well, one skilled in the art will appreciate further features and advantages of the disclosure based on the above-described embodiments. Accordingly, the disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. 

What is claimed is:
 1. A tool assembly, comprising: an anvil assembly having a tissue contacting surface; a cartridge assembly having a tissue contacting surface, the anvil assembly or cartridge assembly being pivotable to move to a clamped position, the cartridge assembly having a channel and a staple cartridge, wherein the channel defines retention slots; compression strips disposed in the retention slots, the compression strips being disposed between the channel and the staple cartridge and being compressible to allow the staple cartridge to move and change the distance between the staple cartridge and the anvil assembly.
 2. The tool assembly of claim 1, wherein each of the compression strips have a connecting portion for connecting with one of the retention slots, and each of the compression strips having a supporting portion with a flat surface for supporting the staple cartridge.
 3. The tool assembly of claim 1, wherein the channel defines notches, each notch communicating with one of the retention slots.
 4. The tool assembly of claim 2, wherein the channel defines notches, each notch communicating with one of the retention slots.
 5. The tool assembly of claim 3, wherein each notch allows access to the retention slots.
 6. The tool assembly of claim 1, further comprising compression pads disposed on a bottom wall of the channel to support the staple cartridge.
 7. The tool assembly of claim 1, wherein thin tissue corresponds to a close relation of the staple cartridge to the anvil assembly, and thicker tissue corresponds to a farther relation between the staple cartridge and the anvil assembly.
 8. The tool assembly of claim 7, wherein thin tissue corresponds to a staple formation having a first configuration and thicker tissue corresponds to a staple formation having a second configuration.
 9. The tool assembly according to claim 1, wherein the channel has a first side wall, a second side wall, and a bottom wall, and wherein the first side wall has an upper edge and the second side wall has an upper edge.
 10. The tool assembly of claim 9, wherein the upper edge of the first side wall defines a plurality of retention slots in the first side wall, and the upper edge of the second side wall defines a plurality of retention slots in the second side wall.
 11. The tool assembly of claim 10, wherein there are compression strips at multiple locations along the first side wall of the channel, and there are compression strips at multiple locations along the second side wall of the channel.
 12. The tool assembly of claim 2, wherein the staple cartridge defines shoulders and the flat surface of the compression strips support the shoulders of the staple cartridge.
 13. A surgical stapling instrument having the tool assembly of claim
 1. 14. A surgical stapling instrument having the tool assembly of claim
 11. 15. The surgical stapling instrument of claim 13, further comprising a mechanical handle.
 16. The surgical stapling instrument of claim 13, further comprising a powered handle. 